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bpf: Check map->record at the beginning of check_and_free_fields()

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When there are no special fields in the map value, there is no need to
invoke bpf_obj_free_fields(). Therefore, checking the validity of
map->record in advance.

After the change, the benchmark result of the per-cpu update case in
map_perf_test increased by 40% under a 16-CPU VM.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250315150930.1511727-1-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Hou Tao
2025-03-15 23:09:30 +08:00
committed by Alexei Starovoitov
parent 8c10109a97
commit bb2243f432
1 changed files with 3 additions and 0 deletions
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3
kernel/bpf/hashtab.c
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@@ -787,6 +787,9 @@ static int htab_lru_map_gen_lookup(struct bpf_map *map,
static void check_and_free_fields(struct bpf_htab *htab,
struct htab_elem *elem)
{
if (IS_ERR_OR_NULL(htab->map.record))
return;
if (htab_is_percpu(htab)) {
void __percpu *pptr = htab_elem_get_ptr(elem, htab->map.key_size);
int cpu;